Picking a clutch - Chevelle Tech
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post #1 of 26 (permalink) Old Feb 12th, 20, 7:18 PM Thread Starter
 
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Picking a clutch

Hey guys. 496ci with about 670hp at the crank. This will be coupled to a tremic 6 speed magnum. I've heard horror stories of guys have 70lbs force to operate clutch pedal. What is the preferred method to getting a soft clutch pedal?
My wife will be driving the car frequently and would like to keep it soft.

I dont know much about clutch materials and brands, types just know how to install them.

Any help would be appreciated! Only wana buy once.
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post #2 of 26 (permalink) Old Feb 12th, 20, 8:23 PM
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Re: Picking a clutch

Mcleod rst street twin or rxt street twin.
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post #3 of 26 (permalink) Old Feb 12th, 20, 8:25 PM
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Rick
 
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Re: Picking a clutch

I ran Center Force dual friction. Less pedal pressure than stock L88 system. I used it behind several engines with sticky tires and it is still good years later.


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post #4 of 26 (permalink) Old Feb 14th, 20, 5:46 AM
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Re: Picking a clutch

Quote:
Originally Posted by mrpaticular View Post
I ran Center Force dual friction. Less pedal pressure than stock L88 system. I used it behind several engines with sticky tires and it is still good years later.
running a small 10.5 dual friction centerforce behind 550 HP bb, muncie and 9 Ford with 3.91 and p325 50 15 drag radials, just right for me.

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post #5 of 26 (permalink) Old Feb 14th, 20, 11:51 AM
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Re: Picking a clutch

I have a similar big block and can tell you with my hydraulic clutch and a SST trx+ clutch it works awesome. I can actuate it with my hand!

It is a ceramic disk which means its somewhat a pain because it does like to grab when it gets hot, so sometimes it's hard to take off but otherwise it isn't an issue. It grabs and hangs on!

This behind a 650hp 489 in a 4000 pound car.
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post #6 of 26 (permalink) Old Feb 15th, 20, 3:10 AM Thread Starter
 
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Thanks guy. Really appreciate the hell
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post #7 of 26 (permalink) Old Feb 15th, 20, 7:00 AM
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Re: Picking a clutch

I went through 2 Zoom 11 clutches from Summit and then switched to a 12 Centerforce . Ran it for years without a problem.


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post #8 of 26 (permalink) Old Feb 15th, 20, 11:00 AM
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Re: Picking a clutch

Put a 11 inch Zoom disc in my 66 back in 1981, clutch pedal would stay on the floor at high rpm shifts. Tore it apart and found a piece of material ripped out of the disc.
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post #9 of 26 (permalink) Old Feb 16th, 20, 11:06 PM
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Bill
 
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I have similar HP and Torque 475ci
I use a Ram Dual Disc 10.5 organic sprung 1 st disc and solid 2 nd disc nice pedal pressure works real nice does not hit as hard as The MCLeod dual disc. I bet the 9.5 Ram would hold the 625 torque

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post #10 of 26 (permalink) Old Yesterday, 5:37 AM
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Re: Picking a clutch

Quote:
Originally Posted by CDN SS View Post
I have similar HP and Torque 475ci
I use a Ram Dual Disc 10.5 organic sprung 1 st disc and solid 2 nd disc nice pedal pressure works real nice does not hit as hard as The MCLeod dual disc. I bet the 9.5 Ram would hold the 625 torque
Bill, by chance do you have a link to the clutch setup you are using? Thanks in advance.

Darren
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post #11 of 26 (permalink) Old Yesterday, 11:06 AM
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I have the Concept 10.5 but I bet the the 9.5 would be fine it has even softer pedal call them the tech guy is very good just make sure you know what flywheel bolt pattern tou have

https://ramclutches.com/product-fami...AaApgeEALw_wcB

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Foxwell 475 BBC 688hp /610 tq
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post #12 of 26 (permalink) Old Yesterday, 11:36 AM
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Bill
 
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When you get over 600lbs of torque then a single disc will work but the disc material will need to be pretty aggressive and hit hard
Street dual disc with organic disc will be easier to drive but with more surface area to hold the big torque
Now if your just cruisin around on street tires then almost any clutch will work but sticky tires and high rpm shifting then go dual disc
When in doubt go softer on the disc over clutching is a parts breaker and no fun to drive on street

66 CDN Malibu SS A51,L34,M20 Aztec Bronze

Tremec by Liberty[/FONT]

Foxwell 475 BBC 688hp /610 tq
9.5 cr pump gas Brodix heads by Foxwell Straub hyd Roller
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post #13 of 26 (permalink) Old Yesterday, 1:15 PM
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Re: Picking a clutch

That Ram Concept 10.5 organic looks like a nice setup. I like the idea of the sprung hub. I would assume that it is this one: https://www.summitracing.com/parts/r...0aArysEALw_wcB

I'm using the McLeod RST organic twin disc clutch that has two solid hubs. I've blown 3 sets of spider gears (Finally replaced the differential with a TrueTrac), and I blew two sets of spiders on the street, so it does hit really hard. Or, I might be a little rough on it sometimes...

To the OP: I use a GM hydraulic throw-out bearing, and it is really nice. There is no adjustment. Very light pedal effort.

https://www.summitracing.com/parts/n...SABEgLw_PD_BwE


Also, if you're running 670hp, I would consider running a ceramic. It is a little more grabby, but managable. Call/email Ram for their suggestions.

'69 Chevelle SS ("NOT" ON THE ROAD NOW!
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post #14 of 26 (permalink) Old Yesterday, 2:04 PM
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My motor makes 688 hp 620 torque the twin organic handles it fine I dint like ceramic its on / off if I would to fo again id pbly go the 9.5 just a little less surface area so you may be able slip clutch on hard launches with slicks less clutch is always better than too much

66 CDN Malibu SS A51,L34,M20 Aztec Bronze

Tremec by Liberty[/FONT]

Foxwell 475 BBC 688hp /610 tq
9.5 cr pump gas Brodix heads by Foxwell Straub hyd Roller
Crusin / Track video
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post #15 of 26 (permalink) Old Yesterday, 2:30 PM
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Quote:
Originally Posted by CDN SS View Post
My motor makes 688 hp 620 torque the twin organic handles it fine I dint like ceramic its on / off if I would to fo again id pbly go the 9.5 just a little less surface area so you may be able slip clutch on hard launches with slicks less clutch is always better than too much
That's the only complaint I have... Sometimes it likes to shutter at take off and chirp the tires because it just grabs
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